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arXiv 2010.05092gr-qchep-th
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Kerr黑洞中标量场微扰的物象

Object picture of scalar field perturbation on Kerr black hole in scalar-Einstein-Gauss-Bonnet theory

Shao-Jun Zhang, Bin Wang, Anzhong Wang, Joel F. Saavedra

摘要:

在时域中研究了标量爱因斯坦高斯博内特(sEGB)理论中克尔黑洞周围的标量扰动。为了克服传统数值计算中经常遇到的“外边界问题”,我们应用双曲紧致化技术进行$(2+1)$维模拟,旨在获得标量场扰动下波传播的精确目标图像。我们发现,足够大的耦合常数之间的标量场和Gauss-Bonnet曲率是负责破坏原来的克尔黑洞。耦合越强,克尔时空的破裂越早,不稳定性越剧烈。我们进一步提出了对象确认的特殊情况下,负耦合存在一个最小的旋转和不稳定性不会发生,无论有多强的耦合。我们还说明了存在耦合时准正规振铃频率的精细结构性质,并给出了sEGB理论的特征印记。我们期望在未来的引力波观测中可以探测到这样的精细结构,以检验sEGB理论。

英文摘要:

Scalar perturbations around the Kerr black hole in scalar-Einstein-Gauss-Bonnet (sEGB) theory are studied in the time domain. To overcome the "outer boundary problem" that usually encountered in traditional numerical calculations, we apply the hyperboloidal compactification technique to perform a $(2+1)$-dimensional simulation aiming to obtain a precise object picture of the wave propagation under the scalar field perturbation. We find that the big enough coupling constant between the scalar field and the Gauss-Bonnet curvature is responsible to destroy the original Kerr black hole. The breakdown of the Kerr spacetime happens earlier and the instability becomes more violent when the coupling becomes stronger. We further present object confirmations on the special case for the negative coupling where there exists a minimum rotation and below which the instability can never happen no matter how strong the coupling is. We also illustrate the fine structure property in the quasinormal ringing frequency once there is the coupling, and present the characteristic imprint of the sEGB theory. We expect that such a fine structure can be detected in the future gravitational wave observation to test the sEGB theory.

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